ORTMANN: monograph of the naiades of PENNSYLVANIA. 31 



Wolfe Creek, Washington Co., Ohio (W. J. Graham). 

 Ohio Canal, Columbus, Franklin Co., Ohio (Smith collection). 

 Scioto River, Kenton, Hardin Co., Ohio (C. Goodrich). 

 Big Beaver Creek, Mercer Co., Ohio (C. Goodrich). 



Wabash River, New Corydon, Jay Co., Geneva, Adams Co., and BlufTton, Wells Co., Indiana (C. Good- 

 rich). 

 West Fork River, Lynch Mines, Harrison Co.; Milford, Harrison Co. (W. J. Graham); Liglitburn and 



Weston, Lewis Co., West Virginia. 

 Little Kanawha River, Grantsville, Calhoun Co. (W. J. Graham) and BurnsvUIe, Braxton Co., West 



Virginia. 

 North Fork Hughes River, Harrisville (W. J. Graham), and Cornwallis, Ritchie Co., West Virginia. 

 Elk River, Shelton, Clay Co., and Gassaway and Sutton, Braxton Co., West Virginia." 

 Levisa Fork Big Sandy River, Prestonsburg, Floyd Co., Kentucky. 

 Licking River, Farmer, Rowan Co., Kentucky. 



Tennessee-drainage: 

 French Broad River and Boyd Creek, at Boyd Creek, Sevier Co., Tennessee. 

 Nolichuckj' River, Chunns Shoals, Hamblen Co., Tennessee. 

 Holston River, Hodges, Jefferson Co.; Turley Mill and Noeton, Grainger Co.; Austin MiU, Hawkins 



Co., Tennessee. 

 South Fork Holston River, Pactolus, Sullivan Co., Tennessee. 



North Fork Holston River, Rotherwood, Hawkins Co., Tennessee; Hilton, Scott Co., Virginia. 

 Clinch River, Sol way, Knox Co. ; Clinton and Offutt, Anderson Co.; Black Fox Ford, Union Co. ; Clinch 



River Station, Claiborne Co.; Oakman, Grainger Co., Tennessee; Speers Ferry and Clinchport, 



Scott Co., Virginia; St. Paul, Wise Co., Virginia; Fink and Cleveland, Russell Co., Virginia. 

 Emory River, Harriman, Roane Co., Tennessee. 

 PoweU River, Combs, Claiborne Co., Tennessee. 



From upper Mississippi northwards and westwards: 

 Little Muddy Creek, DuBois, Washington Co., Illinois (A. A. Hinkley). 

 Sheyenne River, Argusville, Cass Co., North Dakota (S. M. Edwards) (drainage of Red River of the 



North). 

 Meramec River, Meramec Higlilands, St. Louis Co., Missouri (N. M. Grier). 

 James River, Galena, Stone Co., Missouri (A. A. Hinkley). 

 Terre Noir Creek, Mount Zion, Clark Co., Arkansas (H. E. Wheeler). 



All the above specimens are to be considered as typical A. plicata costata. Other sets from Indiana, 

 Illinois, northern Alabama (Tennessee-drainage), Kansas, Arkansas, and Oklahoma, show peculiar 

 features, leading to the western and southern representatives of this form. I cannot go into detail here, 

 yet it should be mentioned that I have from the Alabama drainage one set, which cannot be distinguished 

 from costata. It is from Valley Creek, Toadvine, Jefferson Co., Alabama (H. II. Smith). 



Distribution and Ecology in Pennsylvania (See fig. 4) : This form is not rare 

 in our state. It is found in tlie larger streams as well as in their tributaries, and 

 in general is most abundant in some of the latter. In the Ohio below Pittsburgh 

 it is not very plentiful; in the JNIonongahela proper it has not been found, and it 

 is decidedly rare in the Allegheny. But it turns up again in some of the tributaries 



■'^ In the Kanawha drainage, I have seen a dead shell in Coal River, Sproul, Kanawha Co., W. Va. 



